The picosecond parametric amplification of a polychromatic image with a wavelength bandwidth of 140 nm and a gain of 15 dB has been obtained in a lithium triborate type-I crystal (LBO). Approximately 8 lines/mm in both lateral dimensions were resolved in the crystal plane. This resolution value is in good agreement with a numerical study of the phase-matching conditions near collinear degeneracy, where phase matching is noncritical for the signal beam in angle as well as in wavelength. The parametric amplification of a monochromatic image in LBO is also studied. Because their polarizations are identical, the signal and the idler can interfere, leading to phase-sensitive amplification.
© 1995 Optical Society of America
F. Devaux and E. Lantz, "Parametric amplification of a polychromatic image," J. Opt. Soc. Am. B 12, 2245-2252 (1995)